netdev - Re: [PATCH 1/1] netfilter: udp: Only get 8 bytes header in udp_pkt_to_tuple to keep consistent with tcp_pkt_to

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Date:	Thu, 21 Jul 2016 11:10:27 +0200
From:	Florian Westphal <fw@...len.de>
To:	fgao@...ai8.com
Cc:	pablo@...filter.org, kaber@...sh.net,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	gfree.wind@...il.com
Subject: Re: [PATCH 1/1] netfilter: udp: Only get 8 bytes header in
 udp_pkt_to_tuple to keep consistent with tcp_pkt_to_tuple and comments

fgao@...ai8.com <fgao@...ai8.com> wrote:
> From: Gao Feng <fgao@...ai8.com>
> 
> Signed-off-by: Gao Feng <fgao@...ai8.com>
> ---
>  net/netfilter/nf_conntrack_proto_udp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
> index 4fd0405..a886a8a 100644
> --- a/net/netfilter/nf_conntrack_proto_udp.c
> +++ b/net/netfilter/nf_conntrack_proto_udp.c
> @@ -45,7 +45,7 @@ static bool udp_pkt_to_tuple(const struct sk_buff *skb,
>  	struct udphdr _hdr;
>  
>  	/* Actually only need first 8 bytes. */
> -	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
> +	hp = skb_header_pointer(skb, dataoff, 8, &_hdr);

This comment is a bit misleading; sizeof(udphdr) is 8 bytes so
this patch has no effect.